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gnus-group-transpose-groups). This isn't really a subscription command, but you can use it instead of a kill-and-yank sequence sometimes.
gnus-group-kill-level). These groups can't be yanked back after killing, so this command should be used with some caution. The only time where this command comes in really handy is when you have a `.newsrc' with lots of unsubscribed groups that you want to get rid off. S C-k on level 7 will kill off all unsubscribed groups that do not have message numbers in the `.newsrc' file.
Also see section 2.6 Group Levels.